Yes, I have already checked with the church's email administrator (I'm the church treasurer) and there is nothing on the recipient's side that is working incorrectly. Other church members receive and reply to messages from the same senders with no issues. I can send a brand new email to the sender and it goes through just fine, but if I try to reply to an email from them it gets the "invalid recipient" error message. Their emails to me are marked as "--SPAM--" when they arrive in my inbox.
No, am replying to a single sender from the church's domain "deserthope.org". First it flags the message as spam when it arrives. Have clicked on the "not spam" many times. Have forwarded half a dozen of these to the "thisisnotspam@cox.net" address. I can send a new email to the same recipient and it will go through successfully.
